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    <script>
        // ## 1. 给一段文章中的全部指定词语进行过滤

        // ```javascript
        // // 比如我要过滤 "SM"

        // var str = 'asdasdSMasdasdasdSMsdasdasdSMsadasd'

        // // 需要结果
        // // asdasd**asdasdasd**sdasdasd**
        // ```

        var str = 'asdasdSMasdasdasdSMsdasdasdSMsadasd'
        var res = str.replace('SM','**')
        //while循环判断res这个字符串是否还存在其他'SM'
        while(res.indexOf('SM') !== -1){
            res = res.replace('SM','**')
        }
        console.log(res)
    </script>
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